| Source: Yahoo Finance chart API (QQQ daily closes, interval=1d)
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| URL: https://query1.finance.yahoo.com/v8/finance/chart/QQQ?period1=1672531200&period2=1704067200&interval=1d&events=history&includeAdjustedClose=true
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| Method: For each calendar month in 2023, find highest and lowest "Close" value; volatility = (High - Low)/High * 100.
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| Values below use Yahoo close prices (raw decimals from API), volatility rounded to 2 decimals.
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| Rank | Month | HighDate | HighClose | LowDate | LowClose | VolatilityPct
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| 1 | Jan 2023 | 2023-01-27 | 296.260010 | 2023-01-05 | 261.579987 | 11.71%
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| 2 | Mar 2023 | 2023-03-31 | 320.929993 | 2023-03-10 | 288.549988 | 10.09%
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| 3 | May 2023 | 2023-05-30 | 349.980011 | 2023-05-04 | 316.170013 | 9.66%
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| 4 | Nov 2023 | 2023-11-20 | 390.739990 | 2023-11-01 | 356.959991 | 8.65%
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| 5 | Oct 2023 | 2023-10-11 | 371.220001 | 2023-10-26 | 343.660004 | 7.42%
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| 6 | Aug 2023 | 2023-08-01 | 382.790009 | 2023-08-18 | 358.130005 | 6.44%
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| 7 | Dec 2023 | 2023-12-27 | 411.500000 | 2023-12-06 | 385.049988 | 6.43%
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| 8 | Feb 2023 | 2023-02-02 | 311.720001 | 2023-02-24 | 291.850006 | 6.37%
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| 9 | Sep 2023 | 2023-09-05 | 378.070007 | 2023-09-26 | 354.209991 | 6.31%
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| 10 | Jun 2023 | 2023-06-15 | 370.260010 | 2023-06-07 | 348.820007 | 5.79%
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| 11 | Jul 2023 | 2023-07-18 | 385.739990 | 2023-07-07 | 366.239990 | 5.06%
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| 12 | Apr 2023 | 2023-04-28 | 322.559998 | 2023-04-25 | 309.989990 | 3.90%
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